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HAGATNA, Guam (AP) — Guam security officials have released two videos to help residents prepare for emergencies, including a nuclear missile attack.

The Offices of Guam Homeland Security and Civil Defense said in a statement Tuesday the videos aren’t connected to any imminent threat.

The first tells residents to stockpile emergency supplies and to make an evacuation plan.

The second explains what to do if officials sound the attack tone siren, which would warn of a nuclear attack. It’s a different siren from the alert tone that Guam uses to warn of tsunamis and other natural hazards.

The U.S. territory is advising residents hearing the attack tone siren to shelter in the closest concrete structure and wait until the all-clear is given. That could be hours later.

North Korea earlier this year threatened to launch missiles close to Guam. North Korea has also been developing nuclear weapons.